满江红属系统学研究的新进展

本文从植物系统学角度对满江红属的研究进展作了全面综述。近年来从细胞研 究水平提出了将满江红属重新划分为〖WTBX〗Azolla和Tetrasporocarpia 2个亚 属，经典的三膘（Azolla）和九膘（Rhizosperma)〖WTBZ〗亚属作为新的Subgen Azolla中的2个组（Section)，而原有九膘亚属中的A.nilotica 则成为Subgen.Tetrasporocarpia〖WTBZ〗的一个种。遗传育种和同工酶 的研究证据对A.mexicana,A.microphylla和A.caroliniana能否在Sect. Azolla中占据3个种的分类地位提出疑问。但要完全解决满江红属的系统 学问题，分子生物学技术将是重要手段。由于满江红为蕨 藻共生体，其样本的异质性影响了现有分子标记研究结果的可靠性。

The Progress in Systematic Studies of Azolla

The progress in systematics of the genus Azolla is reviewed in this article. Recent studies at cytological level proposed that the genus should be re-divided into 2 subgenera:Azolla and Tetrasporocarpia. The subgenus Azolla includes section.Azolla and section Rhizosperma, while the subgenus Tetrasporocarpia comprises 1 species: A.nilotica. Based on the evidence from genetic breeding and isoenzymic analysis, A.mexicana,A.microphylla and A.caroliniana are doubted as separate species in section Azolla. For completely solving the problem in systematics of the genus Azolla, molecular biological technique is regarded as an important means. However,since Azolla is a fern_cyanobacteria symbiont,the heterogeneity of its samples have reduced the reliability of the present data for molecular marking.